Which of the following is the outermost shell for elements of second period?

Which of the following statements about the Modern Periodic table are incorrect?

(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic numbers.

(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.

(iii) Isotopes are placed in adjoining groups in the Periodic Table.

(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic numbers.

Arrange the following elements in the order of their increasing metallic character.

$\mathrm{Na}, \mathrm{Si}, \mathrm{Cl}, \mathrm{Mg} , \mathrm{Al}$